| 摘要 |
PURPOSE:To prevent emission of noise waves from high-tension lines, by shielding a DC booster circuit electromagnetically, and connecting lead wires extended to and from the DC booster circuit by the intermediary of a feed-through capacitor. CONSTITUTION:For the electromagnetic shielding of a DC booster circuit 12 which produces noise waves, the circuit 12 is put in an electromagnetic shielding case 18, and lead wires extended to and from the DC booster circuit 12 through the casing 18 are connected by the intermediary of a feed-through capacitor 1a. Thus, it is prevented that noise waves are emitted directly from the booster circuit 12 itself. Further, in order to prevent emission of noise waves from high- tension lines for feeding ignition energy produced by the booster circuit 12 to ignition plugs 11, coil-shaped high-tension wires having an inductance are used for them. With such an arrangement, it is enabled to prevent emission of noise waves. |
